5GHz hairpin bandpass on high end fiberglass (Megtron-6)

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Discussion Overview

The discussion revolves around the feasibility and considerations of implementing a distributed element hairpin bandpass filter operating below 5GHz on high-end fiberglass PCBs, specifically Panasonic Megtron-6, compared to Teflon materials. The conversation touches on aspects such as material properties, moisture absorption, and the use of simulation tools.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant inquires about experiences with hairpin filters on Megtron-6 fiberglass.
  • Another participant suggests considering the Loss Factor of the materials, indicating it may influence the available Q factor.
  • A different participant mentions the typical use of discrete filters instead of distributed filters due to the lack of hermetic sealing on their RF boards.
  • Concerns about moisture absorption and glass weave issues are raised, with one participant expressing hesitation about pursuing the implementation.
  • Questions are posed regarding the availability of simulation tools for this type of work.

Areas of Agreement / Disagreement

Participants express varying levels of concern regarding material properties and design choices, indicating that multiple competing views remain on the suitability of using Megtron-6 for this application.

Contextual Notes

Concerns about moisture absorption and glass weave issues remain unresolved, and the discussion does not clarify the implications of the Loss Factor on filter performance.

Who May Find This Useful

Engineers and designers working with RF circuits, particularly those considering material choices for PCB fabrication in high-frequency applications.

the_emi_guy
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Anyone have experience putting distributed element hairpin filter (<5GHz) on high-end fiberglass, such as Panasonic Megtron-6 PCB (vs. Teflon)?
 
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Not directly, but look at the Loss Factor for each. It may affect the available Q.
 
No hermetic seal, moisture absorption was one of my concerns. Also concerned about glass weave issues.
Probably not going to attempt it, just curious if anyone out there has been down that road.
 
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